org.apache.accumulo.examples.mapreduce.RowHash.java Source code

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Here is the source code for org.apache.accumulo.examples.mapreduce.RowHash.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.accumulo.examples.mapreduce;

import java.io.IOException;
import java.util.Base64;
import java.util.Collections;

import org.apache.accumulo.core.client.mapreduce.AccumuloInputFormat;
import org.apache.accumulo.core.client.mapreduce.AccumuloOutputFormat;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Mutation;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.util.Pair;
import org.apache.accumulo.examples.cli.MapReduceClientOnRequiredTable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.io.MD5Hash;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

import com.beust.jcommander.Parameter;

public class RowHash extends Configured implements Tool {
    /**
     * The Mapper class that given a row number, will generate the appropriate output line.
     */
    public static class HashDataMapper extends Mapper<Key, Value, Text, Mutation> {
        @Override
        public void map(Key row, Value data, Context context) throws IOException, InterruptedException {
            Mutation m = new Mutation(row.getRow());
            m.put(new Text("cf-HASHTYPE"), new Text("cq-MD5BASE64"),
                    new Value(Base64.getEncoder().encode(MD5Hash.digest(data.toString()).getDigest())));
            context.write(null, m);
            context.progress();
        }

        @Override
        public void setup(Context job) {
        }
    }

    private static class Opts extends MapReduceClientOnRequiredTable {
        @Parameter(names = "--column", required = true)
        String column;
    }

    @Override
    public int run(String[] args) throws Exception {
        Job job = Job.getInstance(getConf());
        job.setJobName(this.getClass().getName());
        job.setJarByClass(this.getClass());
        Opts opts = new Opts();
        opts.parseArgs(RowHash.class.getName(), args);
        job.setInputFormatClass(AccumuloInputFormat.class);
        opts.setAccumuloConfigs(job);

        String col = opts.column;
        int idx = col.indexOf(":");
        Text cf = new Text(idx < 0 ? col : col.substring(0, idx));
        Text cq = idx < 0 ? null : new Text(col.substring(idx + 1));
        if (cf.getLength() > 0)
            AccumuloInputFormat.fetchColumns(job, Collections.singleton(new Pair<>(cf, cq)));

        job.setMapperClass(HashDataMapper.class);
        job.setMapOutputKeyClass(Text.class);
        job.setMapOutputValueClass(Mutation.class);

        job.setNumReduceTasks(0);

        job.setOutputFormatClass(AccumuloOutputFormat.class);

        job.waitForCompletion(true);
        return job.isSuccessful() ? 0 : 1;
    }

    public static void main(String[] args) throws Exception {
        ToolRunner.run(new Configuration(), new RowHash(), args);
    }
}